Now if its a distribution list you have setup in side your contacts list in outlook try the following This should work and let me know if you have any questions about it.
Open your Outlook, click Distribution List you are trying to export.
And click File, Save As...
On the Save As window, select Text Only (*.txt) in the Save As Type drop down on the bottom.
Open Excel and Open the saved file above. Make sure its set to all files so you can see the text file
When you select the file from previous step, you will be automatically redirected to Text Import Wizard.
You can keep the default value, but on Step 1 of 3 screen, please make sure you select the right Start import at row:. Since the default value of 1 is apparently not what you want with something like "Distribution List Name: ...." occupy at least 4 rows. So you can find the first row with email address and put the row number (on the left) in the Start import at row: number field.
When you continue with "Next" clicking, you just review the screen and make sure everything is what you want, and click Finish in the last step.
And your file will be opened in Excel successfully.
In Excel, click File, Save As and on the Save As window, make sure you change the Save as Type as CSV like the screen below.
Name your file and save it this csv file should be setup for you to import into madMini now do this for each of your distribution lists.